Mesh Library - Loop

Sturcture :	Loop
source :	loop.c

Definition:

struct loop{
  
       HalfEdge *ledges;
       Face     *lface;

       int      alivel;
};

Data Members:

ledges - double linked list of halfedges, which are ordered counter clockwisely by next pointer.
lface - back pointer to the face current loop belongs to.
alivel - indicating if current loop is alive.

Methods:

void LoopConstruct( Face ** f, Vertex * a, Vertex * b,Vertex *c);
Give three vertices a,b,c and the face f, construct a loop in f. a, b, c should be ordered ccw.
void LoopDestruct( Loop ** l);
Destruct loop l.

The current version, there are only three halfedges in a loop, so it only supports triangular meshes.if you want to support arbitrary sided faces in your mesh, just change the constructor of loop.